Tweens, defined as kids between the ages of 8 and 12, spend about six hours using media each day.

James Steyer, CEO of Common Sense Media, summed up the findings:

I think the sheer volume of media technology that kids are exposed to on a daily basis is mind-boggling. It just shows you that these kids live in this massive 24/7 digital media technology world, and it's shaping every aspect of their life. They spend far more time with media technology than any other thing in their life. This is the dominant intermediary in their life."

The study focused on 2,600 kids between the ages of 8 and 18.

Time spent staring at a screen appears to be rather high, with teenagers' eyeballs glued to a computer, phone or tabled six-and-a-half hours each day. Tweens came in at four-and-a-half hours.

There were some other alarming findings, as well:

50% of teenagers tend to use social media when they do their homework, while 60% admit to texting

about two-thirds of kids who watch TV or text while doing homework thinks that behavior has no effect, while half say the same thing about social media

62% of teenage boys admit they like video games a lot. That's a huge jump from the 20% of girls who say that.

29% of teenage boys say they like social media a lot, much lower than the 44% of girls in the same age group

more than half of all tweens have their own tablet, while two-thirds of teens have smartphones